Re: Debian conference in the US?
Now that you've got this release out, have you given any thought to the
message I sent earlier about merging gdb server versions?
Here it is again in case you've forgotten:
The current version of gdbserver in uClinux-dist only works on the m68k.
In my v850-specific version of uClinux-dist, I include a version of
gdbserver that works on the v850, which I created based on gdb-5.3. I
think it should generally be much more portable than the old version, as
it's far less hacked up (the only changes I made to put it into the
uClinux-dist/user tree are to move the files around to fit the old
scheme better; I have a shell script that does that automatically).
I haven't yet sent my patches to gdb-central because I'm waiting to get
a copyright disclaimer, but perhaps you might want to include this newer
version in uClinux-dist?
I suppose it will work on other platforms too; the issues that I know
(1) In linux-low.c, I do this to get the various address offsets
(similar to the code in the old m68k gdbserver, which uses
text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0);
text_len = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_LEN, 0);
real_data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0);
I defined PT_TEXT_ADDR, PT_TEXT_LEN, and PT_DATA_ADDR in
include/asm-v850/ptrace.h in the kernel:
/* These are `magic' values for PTRACE_PEEKUSR that return info
about where a process is located in memory. */
#define PT_TEXT_ADDR (PT_SIZE + 1)
#define PT_TEXT_LEN (PT_SIZE + 2)
#define PT_DATA_ADDR (PT_SIZE + 3)
Could you add similar to defines to the other uClinux ports, so
that the linux-low.c code will work on them too? BTW, notice that
I used `PT_TEXT_LEN' instead of `PT_TEXT_END_ADDR' (which is
what the m68k uses), as addr-len pairs generally seem cleaner to
me than addr-endaddr pairs (makes the code slightly simpler too).
(2) Since stuff in uClinux-dist comes `pre-configured' (i.e. doesn't
get to run the configure script), and I of course configured it for
the v850, the gdbserver Makefile needs to somehow select the proper
machine-dependent files to use. Currently the only
machine-dependent bits seem to be these:
DEPFILES = reg-v850e.o linux-low.o linux-v850e-low.o
Perhaps it would be good enough to change this to something like:
DEPFILES = reg-$(CPU).o linux-low.o linux-$(CPU)-low.o
But I'm not sure where I can get CPU from; is there something
handy in the uClinux-dist Makefiles that could be used? The set
of CPU values used in (my version of) gdbserver are:
v850e, s390, arm, x86-64, i386, mips, ppc, sh, ia64, m68k
So it seems that the most `obvious' value should work OK Hmmm,
perhaps I ought to change `v850e' to be `v850' for compatibility
with the kernel, etc... sigh.
What are your thoughts?
`To alcohol! The cause of, and solution to,
all of life's problems' --Homer J. Simpson